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EspañolLIST OF INTRASTATE INTERSTATE HIGHWAYS
(Redirected from List of intrastate Interstate highways)
There are several 'intrastate Interstate Highways'; that is, Interstate Highways that are located entirely within one state. The concept seems contradictory at first; it is important to note that the word "Interstate" refers to the way the entire group of highways is funded (as a national system of interconnected highways), not to the route each given highway travels.
As Alaska and Hawaii do not share land borders with any other U.S. state, their Interstate highways are all located fully within their respective state's boundaries. Puerto Rico is not a state; however, it also has highways funded by the Federal Government as Interstate highways.
''H-1'', ''H-2'', and ''H-3'' stand for Hawaii-1, Hawaii-2, and Hawaii-3, respectively. These freeways are part of the Interstate Highway System and are thus called Interstate highways.
Interstate highways in Alaska and Puerto Rico are not signed as Interstate highways, and are designated as such primarily for purposes of Federal funding. Interstates A-1 through A-4 are located in Alaska, and Interstates PRI-1 through PRI-3 are located in Puerto Rico.
★ This list only includes the primary Interstate highways (those with route numbers less than 100). Most (but not all) three digit Interstates are intrastate. Interstate H-201 is considered a three digit Interstate as well.
★
Interstate 73 may eventually reach Michigan and South Carolina.
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Interstate 49 may eventually reach Kansas City, Missouri.
★
Interstate 99 may eventually extend through New York but it currently has no direct connection with any other interstate. Surface roads connect it with I-70/I-76 at its south end.
★
Interstates 19 and 87 reach the Mexican and Canadian borders, respectively, but do not cross any state lines.
1. FHWA Route Log and Finder List: Table 1
The intrastate Interstate Highways in the contiguous United States, highlighted in red, not including Interstates 73 and 99.
There are several 'intrastate Interstate Highways'; that is, Interstate Highways that are located entirely within one state. The concept seems contradictory at first; it is important to note that the word "Interstate" refers to the way the entire group of highways is funded (as a national system of interconnected highways), not to the route each given highway travels.
| Contents |
| Within the contiguous 48 states |
| Outside of the contiguous 48 states |
| Signed Interstates |
| Unsigned Interstates |
| Notes |
| References |
Within the contiguous 48 states
Outside of the contiguous 48 states
As Alaska and Hawaii do not share land borders with any other U.S. state, their Interstate highways are all located fully within their respective state's boundaries. Puerto Rico is not a state; however, it also has highways funded by the Federal Government as Interstate highways.
Signed Interstates
''H-1'', ''H-2'', and ''H-3'' stand for Hawaii-1, Hawaii-2, and Hawaii-3, respectively. These freeways are part of the Interstate Highway System and are thus called Interstate highways.
| Interstate Highway | Route | Length1 |
|---|---|---|
 | Kapolei, HI (HI-93) to Honolulu, HI (HI-72) | 27.2 mi |
 | Pearl City, HI (H-1) to Wahiawā, HI (HI-99) | 8.3 mi |
 | Hālawa, HI (H-1) to Marine Corps Base Hawaii | 15.3 mi |
Unsigned Interstates
Interstate highways in Alaska and Puerto Rico are not signed as Interstate highways, and are designated as such primarily for purposes of Federal funding. Interstates A-1 through A-4 are located in Alaska, and Interstates PRI-1 through PRI-3 are located in Puerto Rico.
| Interstate Highway | Route | Length |
|---|---|---|
 | Anchorage, AK (A-3) to Canadian border | 408.2 mi |
 | Tok, AK (A-1) to Fairbanks, AK (A-4) | 202.2 mi |
 | Anchorage, AK (A-1) to Soldotna, AK | 148.1 mi |
 | Palmer, AK (A-1) to Fairbanks, AK (A-2) | 323.7 mi |
 | Ponce, PR (PRI-2) to San Juan, PR (PRI-2) | 71.1 mi |
 | Ponce, PR (PRI-1) to San Juan, PR (PRI-3) | 138.1 mi |
 | San Juan, PR (PRI-2) to Ceiba, PR | 40.6 mi |
Notes
★ This list only includes the primary Interstate highways (those with route numbers less than 100). Most (but not all) three digit Interstates are intrastate. Interstate H-201 is considered a three digit Interstate as well.
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References
1. FHWA Route Log and Finder List: Table 1
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